亚急斜煤层采空场覆岩变形破坏数值与相似模拟  

Numerical simulation and similarity simulation of overburden deformation in abandoned stope in mining sub-steep seams

作　　者：邵小平[1] 石平五[1] 张嘉凡[2] 

机构地区：[1]西安科技大学、能源学院教育部西部矿井开采与灾害防治重点实验室,陕西西安710054 [2]西安科技大学基础课部,陕西西安710054

出　　处：《西安科技大学学报》2008年第2期249-253,共5页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金资助项目(50274058);2005年高等学校博士点专项基金资助项目(20040704002)

摘　　要：依据煤层倾角及开采后顶板破坏特征及其影响不同,将倾角在45～60°的煤层称为亚急斜煤层,其开采过程中顶板影响相对显著。文中针对乌鲁木齐矿区,通过相似材料与数值模拟试验,对亚急斜水平分段放顶煤开采过程中采空场覆岩变形破坏特征进行了试验研究。研究结果表明:亚急斜煤层开采过程中采空场覆岩变形破坏主要沿煤层法向方向发展;基本顶(老顶)岩层破坏后并没有直接垮落,而是有可能形成一定的结构体——铰接岩块结构;关键层位结构体的回转失稳是造成大范围覆岩剧烈活动的根本原因;岩层结构的存在,特别是关键层位结构体的存在,使得覆岩大范围垮落对工作面的影响程度大大降低了,支架可以保持良好的运转,有助于工作面的安全高效生产。According to different obliquity of the seam, failure character and influence factor, the seam which obliquity is from 45° to 60° is termed sub-steep seam. Effect of roof is relatively remarkable in mining sub-steep seams. In view of the Urumqi mining area, this paper studied characters of overburden deformation of horizontal section top coal caving by using numerical and similarity simulation. The result of experimentation reveals that overburden deformation mainly develops towards normal direction along the coal seam in gob field. The basic roof （the main roof） which has been destroyed didn＇t collapse immediately. It may form definite structure body-rock blocks with hinge structure. This paper points out that rotary instability of structure is essential reason of acute overburden deformation in key strata. Existence of strata structure, especially the key strata, has greatly reduced dramatic impact of large-scale activities of overburden on working face. Support resistance would not remarkably increase. The support could keep good operation properties which guarantees safet production of working face.

关 键 词：水平分段放顶煤 铰接岩块结构 关键层位 

分 类 号：TD325.1[矿业工程—矿井建设]